köken: Uncertain. Hypothesized to be from Proto-Italic *ɣlaðros, from Proto-Indo-European *gʰl̥h₂dʰ-ro- (“smooth”), from Proto-Indo-European *gʰleh₂dʰ- (“smooth, shiny”), which is reconstructed based on the assumed cognates Proto-Germanic *gladaz (whence German glatt (“smooth”)) and Proto-Balto-Slavic *glā́ˀdus (“smooth”) (whence Lithuanian glodùs (“tool for smoothing”)). These stem from a basic root…